Because of the polar growth manner ZnO of different shapes has been synthesized. However, the isotropic shapes of ZnO have not reported yet. In this paper, the novel ZnO microspheres were synthesized by the complex system in which starting reagents, Zn(AC)(2), H2O, and HMT, were kept in methanol solution at 60' degreesC for 12 h. The FE-SEM images and XRD pattern results show that the microspheres are formed by ZnO nanoplates that align in a regular periodicity via self-assembly. The formation mechanism of this nanostructure was discussed briefly.